Study of alpha-gamma correlation in the reaction plane and the mechanism of the sup(28)Si (α,α'γ)sup(28)Si reaction

The alpha-gamma correlations have been measured between the α-particles inelastically scattered to the 1.78, 4.62, 4.98, 6.28, 7.38 and 7.80 MeV excited states in sup(28)Si and the gamma rays corresponding to the first excited-ground state transition. The incident α-particle energies were 24, 26, 27 and 27.5 MeV. The analysis of the correlation functions and inelastic scattering cross-sections were performed in terms of the statistical and direct reaction models. Hauser-Feshbach, Coupled Channels and DWBA type of calculations were carried out and conclusions concerning reaction mechanism are given. (author)